Sn引入方式对Al2O3负载Pt基催化剂丙烷脱氢性能的影响

Effect of Sn Introduction on the Dehydrogenation Performance of Propane of Al2O3⁃Supported Pt⁃Based Catalysts

韩飞飞 焦建豪 田祥臣 杨野 秦玉才 宋丽娟

Feifei HAN Jianhao JIAO Xiangchen TIAN Ye YANG Yucai QIN Lijuan SONG

辽宁石油化工大学 石油化工学院，辽宁 抚顺 113001 中国石油大学（华东） 化学工程学院，山东 青岛 266000

School of Petrochemical Engineering，Liaoning Petrochemical University，Fushun Liaoning 113001，China School of Chemical Engineering，China University of Petroleum（East China），Qingdao Shandong 266000，China

Sn助剂可有效提高丙烷脱氢Pt基催化剂的丙烯选择性并抑制积碳的产生，但是Sn的助剂效应尚不明晰。采用共浸渍法和溶胶凝胶法调变Sn的引入方式，构建不同PtSn作用体系，并系统地探究了Sn引入方式对Pt基催化剂丙烷脱氢反应性能的影响；采用XRD、BET对催化剂的织构性质进行表征，通过H2?TPR、TEM、CO?IR对助剂Sn的结构进行辨析，并对催化剂进行了丙烷脱氢反应性能评价与积碳分析。结果表明，相较于共浸渍法制备的PtSn/γ?Al2O3，溶胶凝胶法制备的Pt/Sn?γ?Al2O3具有较低的比表面积和较大的孔径，可促进PtSn团簇与载体间的相互作用，实现金属的高分散度；Pt/Sn?γ?Al2O3有较多的活性位，因此丙烷转化率和丙烯收率较高，同时载体的大孔径也使催化剂的积碳量显著降低。

Sn additives can effectively improve the propylene selectivity of propane dehydrogenated Pt?based catalysts and inhibit the generation of carbon deposition,but the effect of Sn additives is still unclear.Therefore,in this paper,different PtSn action systems were constructed by co?impregnation method and sol?gel method to modulate the introduction of PtSn,and the effect of Sn introduction methods on the dehydrogenation performance of propane of Pt?based catalysts was systematically explored.XRD and BET were used to characterize the texture properties of the catalyst,H2?TPR,TEM and CO?IR were used to distinguish the Sn structure of the additives,and the propane dehydrogenation reaction evaluation and carbon deposition analysis of the catalysts were carried out.The results show that compared with the PtSn/γ?Al2O3 catalyst prepared by co?impregnation method,the Pt/Sn?γ?Al2O3 catalyst prepared by sol?gel method has a lower specific surface area and higher pore size,which can promote the interaction between PtSn clusters and carriers to achieve high metal dispersion.More active sites give the Pt/Sn?γ?Al2O3 catalyst higher propane conversion and propylene yield,and the larger pore size of the carrier also significantly reduces the carbon deposition of the catalyst.

国家自然科学基金项目(91961110)

10.12422/j.issn.1006-396X.2024.04.007